I might add, and you may already know this if you've searched at all, the Fenix is very easy to install on the helmet with some common rubber bands.

One on the bar, one on the helmet for me. That baby on the helmet is deadly, you need to be real careful where you aim it.

In fact as I think of it, as a be seen light the helmet is probably the best place for it no? Aim it directly at whoever's attention you may need.